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Secondary Rainbows

fainter than a primary rainbow

A secondary rainbow
appears outside of a
primary rainbow
and develops when light entering a raindrop undergoes two
internal reflections instead of just one (as
is the case with a primary rainbow).
The intensity of light is reduced even further by the second reflection, so
secondary rainbows are not as bright as primary rainbows.
Alternatively: fewer light rays go through the four-step
sequence than the three-step sequence.